Table 2—

Age-adjusted prevalence of diagnosed, undiagnosed, and total diabetes according to level of obesity*

BMI levelNHES (1960–1962)NHANES I (1971–1974)NHANES II (1976–1980)NHANES III (1988–1994)NHANES (1999–2000)Probability of increase: since 1976 (since 1960)
Diagnosed diabetes
    < 25 kg/m21.5 ± 0.22.7 ± 0.32.5 ± 0.22.1 ± 0.23.0 ± 0.751.8 (87.6)
    25.0–29.9 kg/m21.5 ± 0.32.6 ± 0.33.0 ± 0.24.4 ± 0.44.1 ± 0.890.8 (>99.9)
    30.0–34.9 kg/m22.3 ± 0.55.4 ± 0.85.4 ± 0.86.6 ± 0.66.7 ± 0.966.0 (99.6)
    ≥35 kg/m24.9 ± 1.28.0 ± 1.38.6 ± 1.412.6 ± 1.215.1 ± 2.088.7 (>99.9)
    Overall1.8 ± 0.23.2 ± 0.23.3 ± 0.24.7 ± 0.35.8 ± 0.599.9 (>99.9)
Undiagnosed diabetes
    <25 kg/m20.9 ± 0.31.1 ± 0.31.1 ± 0.554.6
    25.0–29.9 kg/m21.3 ± 0.31.9 ± 0.32.4 ± 0.970.5
    30.0–34.9 kg/m23.8 ± 1.25.7 ± 0.84.3 ± 1.355.0
    ≥35 kg/m212.5 ± 2.77.4 ± 1.63.2 ± 1.34.5
    Overall2.0 ± 0.32.7 ± 0.32.4 ± 0.566.6
Total diabetes (diagnosed and undiagnosed)
    <25 kg/m23.4 ± 0.33.2 ± 0.44.1 ± 0.955.3
    25.0–29.9 kg/m24.3 ± 0.46.4 ± 0.56.5 ± 1.240.3
    30.0–34.9 kg/m29.2 ± 1.412.3 ± 1.111.0 ± 1.764.1
    ≥35 kg/m221.1 ± 3.319.9 ± 2.118.3 ± 2.542.5
    Overall5.3 ± 0.47.5 ± 0.48.2 ± 0.899.9
  • Data are percent ± SE or percent.

  • *

    * Denominator for diagnosed diabetes and total diabetes is based on the interview sample (all participants with BMI and self-reported diabetes) (n = 6,240, 12,900, 11,761, 14,301, and 3,598 for the five consecutive surveys, respectively). Denominators for undiagnosed diabetes are based on the subsample who had attended the fasting morning examinations (n = 3,786, 5,800, and 1,441 for the three surveys, respectively). Probabilities since 1960 are based on the slope of a fitted regression line, whereas probabilities since 1976 are based on comparison of 1976–1980 and 1999–2000 data points. Total diabetes may differ from the sum of diagnosed and undiagnosed diabetes due to rounding error. All results are age adjusted to the U.S. 2000 census population.